Locking device



FIG. 1 is a perspective view of a locking device, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view of the locking device, shown in use with environment.

The broken lines depict portions of the article and environment that form no part of the claimed design. 

CLAIM We claim, the ornamental design for a locking device, as shown and described. 